WO2011011982A1

WO2011011982A1 - Canned motor pump for enclosed circulation system

Info

Publication number: WO2011011982A1
Application number: PCT/CN2010/001163
Authority: WO
Inventors: 韩元平
Original assignee: 上海新沪电机厂有限公司
Priority date: 2009-07-30
Filing date: 2010-07-30
Publication date: 2011-02-03
Also published as: CN101988513B; CN101988513A

Abstract

A canned motor pump for enclosed circulation system comprises a canned motor (100) and a pump (200) driven by the canned motor. Said pump (200) includes a pump case (210) connected with the case of the canned motor, an impeller (250) connected with a rotor shaft of the canned motor. An automatic exhaust valve installation chamber (260) is provided on the pump body of said pump, and an air hole (261) communicated with a water inlet chamber (211) in the pump body is provided on the wall of the automatic exhaust valve installation chamber (260). A slot (262) is arranged in an orifice of the automatic exhaust valve installation chamber (260), and an automatic exhaust valve (300) is arranged in the automatic exhaust valve installation chamber (260) through a retaining member (320) inserted in the slot (262). The inconvenient problem of manual exhaust occurred in operating process of the pump and the safety and environment pollution problems caused by the damage of other electrical equipments due to the water leakage in the pump because of the difficulty in controlling by manual exhaust are solved by the invention, therefore the objects of safety, convenience, and environment protection are achieved.

Description

A shielded electric pump applied to a closed circulation system

The present invention relates to a shield pump, and more particularly to a shielded electric pump for a closed loop system. Background technique:

The shielding pump used in the closed circulation system belongs to a centrifugal pump. Its working principle is: relying on the centrifugal force principle design, the high-speed rotating impeller drives the medium to rotate, and the medium is thrown out to achieve the purpose of transportation.

The shielding pump is characterized by an integrated structure of the motor and the pump, all of which are statically sealed, so that the electric pump is completely leak-free; the fully enclosed, leak-free structure can transport a variety of media. The existing shielded electric pump uses a circulating medium to cool the shielded motor, thus eliminating the cooling fan, enabling the shielded electric pump to operate in a low-noise or even quiet environment, suitable for occasions requiring low environmental noise, such as a home, a work room, etc. .

The existing shielding pump is suitable for medium transmission of some closed circulation systems, such as wall-mounted furnace medium circulation system, geothermal circulation system, ground source heat pump air conditioning circulating water system; medium porosity in lithium bromide air conditioning unit; heating and heating circulating water system, etc. .

However, when the existing shielded pump is applied to a closed circulation system, one problem that needs to be solved is the exhaust problem of the closed pipeline. This is because the liquid medium always evaporates to form some gas during the operation, and if these gases are not timely The discharge of the closed pipeline will accumulate in the electric pump to generate cavitation, and at the same time, due to the presence of gas, the gas resistance is easily formed, which also affects the transmission efficiency of the shielded electric pump.

In order to discharge the gas in the closed pipeline, a manual exhaust vent is set in the closed pipeline, and the manual exhaust valve is opened periodically to eliminate the gas in the closed pipeline, but this operation will result in a closed conduit. Liquid leakage in the road causes environmental pollution.

Since the front cover of the impeller in the shielded electric pump currently used in the closed pipeline and the static spout on the inner partition of the pump casing form a single-mouth ring (leakage ring), the leakage amount is considered in the design ( That is, the liquid in the high pressure zone leaks into the low pressure zone, and the presence of the leakage has an energy loss called volume loss in the industry. Due to the existence of the volume loss, in order to reduce the loss, it is desirable that the gap here is as small as possible, and it is considered that the one-side gap here (i.e., at the mouth ring) is 0.3 mm. But because the gap here is the cumulative error after assembly of all parts of the product (including the shape and position errors of the parts and

1

Confirmation Dimensional error), if the design requirements are to be ensured, the dimensional accuracy of the component must be increased, which will lead to a series of problems, such as processing problems, configuration of measuring instruments, configuration of processing equipment, etc., and due to zero The accuracy of the components is increased, resulting in a doubling of the processing cost of the components. Summary of the invention

The invention provides a shielded electric pump with an automatic exhaust function for the above-mentioned technical problems existing in the shielded electric pump used in the existing closed circulation system, and the shielded electric pump is applied to the closed circulation system, which can effectively improve the shielded electric power Pump delivery efficiency.

In order to achieve the above object, the present invention adopts the following technical solutions:

A shielded electric pump applied to a closed circulation system, comprising a shield motor and a pump driven by a shield motor, the pump comprising a pump casing and an impeller, wherein the pump casing is connected to a motor casing of the shield motor, An impeller is coupled to the rotor shaft of the shield motor, and a partition disposed in the pump casing is partitioned into a water inlet chamber and an impeller mounting chamber, and a static mouthpiece is disposed at a center of the partition. The utility model is characterized in that: an automatic exhaust valve mounting cavity is arranged on the pump body, and an air gap hole communicating with the water inlet cavity in the pump body is opened in the cavity wall of the automatic exhaust valve mounting cavity; The cavity of the exhaust valve mounting cavity is provided with a card slot, and an automatic exhaust valve is installed in the automatic exhaust valve mounting cavity by a card inserted into the card slot.

The automatic exhaust valve includes:

a valve seat, a cavity for accommodating the valve core assembly is disposed in the valve seat, a threaded hole for installing the valve core assembly is disposed on a sidewall of the valve seat; and a protruding valve seat top is disposed at a top of the valve seat a cap mounting post, a first venting hole is disposed in the cap mounting post;

a spool assembly, the spool assembly including a spool, a valve plug, a valve stem, a spring, the first end of the wide core is provided with an external thread connected to a threaded hole in the valve seat The external thread of the valve core is screwed into the threaded hole in the valve seat, so that the valve core assembly is laterally installed in the cavity of the valve seat; the second end of the valve core is internally provided with a cross a second exhaust hole and a third exhaust hole that meet; the third exhaust hole is in communication with the first exhaust hole; the valve plug is installed in the first end of the valve stem to seal the second An air inlet of the vent; the second end of the valve stem is coupled to the second end of the spool by a spring;

a float, the float is floatingly mounted under the valve seat by a U-shaped rail frame connected to the valve seat, the float is floatingly located in the U-shaped rail frame, and the float is connected through a line Said a second end of the valve stem is connected; a cavity of the upper portion of the float is a gas accumulating cavity;

a cap that is screwed onto the cap mounting post, and an inner ring sealing ring that protrudes downward to seal the first exhaust hole is disposed on an inner top surface of the cap; A fourth venting hole is defined in the side of the cap.

The invention is provided with a sealing outer convex ring and a sealing outer annular surface disposed under the sealing convex ring outside the valve seat, and a sealing seal is arranged in the automatic exhaust valve mounting cavity to cooperate with the sealing outer annular surface The sealing inner ring and the step for sealing the sealing outer ring are provided with a sealing ring between the sealing outer ring and the step.

The present invention is symmetrically disposed on a side surface of the float with a rail groove for accommodating the U-shaped rail frame. The first venting hole of the present invention is a tapered hole having a large upper and lower diameter, and the outer annular surface of the air outlet sealing ring on the cap is sealed.

The impeller of the present invention comprises an impeller front cover and an impeller rear cover which are connected to each other, and an impeller cavity is arranged between the impeller front cover and the impeller rear cover, and communication is arranged in the center of the impeller front cover The impeller chamber and the inlet of the water inlet chamber are provided with a ring groove at the edge of the suction port, and the static mouthpiece is inserted into the ring groove to form a gap between the static mouthpiece and the mouth of the suction port. A double port ring seal; a connecting sleeve connected to the rotor shaft is disposed at a center of the impeller rear cover.

Due to the above technical solution, the present invention has the following advantages over the conventional shielded pump used in the closed circulation system:

1. It can automatically complete the problem of exhausting the shielded electric pump during use and during use. It avoids the problem of medium leakage pollution caused by manual manual exhaust when the shielded electric pump is used and the use process, and avoids the occurrence of air resistance. Increases the efficiency of the shielded electric pump and reduces energy consumption and noise.

2. Optimized the cavitation allowance, improved the performance of the pump, reduced the energy consumption, ensured that the pump body and impeller of the electric pump were not damaged by cavitation, and improved the service life of the electric pump.

3. After adopting the design of the double-mouth ring, the path to be passed increases due to the leakage of the liquid high-pressure zone to the low-pressure zone, and the two dynamic seal rings formed by the impeller at high-speed rotation further slow down the high-pressure zone. The process of leaking liquid into the low pressure zone can be enlarged to 1.0 mm by the single side gap at the mouth ring, thereby reducing the dimensional accuracy requirements of the components, reducing the investment in processing equipment and measuring instruments, thereby greatly reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS:

The invention is further described below in conjunction with the drawings and specific embodiments.

1 is a schematic structural view of a shielded electric pump of the present invention.

Fig. 2 is an enlarged schematic view of Fig. 1.

Figure 3 is a schematic view showing the assembly of the pump body and the automatic exhaust valve of the present invention.

Figure 4 is a schematic view showing the structure of an automatic exhaust device of the present invention.

Figure 5 is a cross-sectional view taken along line A-A of Figure 4 . detailed description:

In order to make the technical means, creative features, achievement goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

As shown in Figs. 1 and 2, the shielded electric pump for a closed circulation system of the present invention includes a shield motor 100 and a pump 200, and the shield motor 100 drives the pump 200 to operate. The shielded motor 100 of the present invention is substantially identical in construction to the existing shielded motor and will not be described in detail herein.

The pump 200 of the present invention includes a pump casing 210 in which the pump casing 210 is partitioned into a water inlet chamber 211 and an impeller mounting chamber 212, and a stationary mouthpiece 221 is disposed in the center of the partition plate 220. The water inlet 230 of the pump 200 is disposed below the pump casing 210, and the central axis of the water inlet 230 is parallel to the central axis of the pump casing 210. The water inlet 230 communicates with the water inlet chamber 211 in the pump casing 210, and the water inlet port 230 is offset from the stationary mouthpiece 221 by a position. The water outlet 240 of the pump 200 is disposed at the top of the pump casing 210 and communicates with the impeller mounting cavity 212, the central axis of which is perpendicular to the central axis of the pump casing 210.

The impeller 250 impeller includes an impeller front cover 251 and an impeller rear cover 252 which are connected to each other. An impeller chamber 253 is disposed between the impeller front cover 251 and the impeller rear cover 252, and communication is provided at the center of the impeller front cover 251. The impeller chamber 253 and the suction port 254 of the water inlet chamber 211 are provided with a ring groove 254a at the edge of the suction port 254, and the stationary mouthpiece 221 is inserted into the ring groove 254a to make the edge of the stationary mouthpiece 221 and the suction port 254 A double-ported ring-shaped seal is formed between the two, and after the design of the double-mouth ring is adopted, the path to be passed increases when the liquid high-pressure zone leaks to the low-pressure zone, and the two dynamic seal rings formed when the impeller rotates at a high speed, Thereby, the process of leaking the liquid in the high pressure zone to the low pressure zone is further slowed down, and the single side gap at the mouth ring can be enlarged to 1.0 mm, thereby reducing the dimensional accuracy requirements of the components and reducing the processing equipment and measuring instruments. The input, which greatly reduces the cost. In the rear cover of the impeller A center of the 253 is provided with a connecting sleeve 255 that is coupled to the rotor shaft 110.

Referring to FIG. 3, an automatic exhaust valve mounting chamber 260 is disposed at an upper portion of the pump casing 210. An air gap 261 is formed in the wall of the automatic exhaust valve mounting chamber 260 to communicate with the water inlet chamber 211 in the pump casing 210. The air gap hole 261 is located at the upper portion of the water inlet chamber 211, so that the gas and the medium entering the water inlet chamber 211 enter the automatic exhaust valve installation chamber 260 from the air gap hole 261, and enter the automatic exhaust valve installation chamber. The gas in 260 will continue to ascend and is discharged by automatic vent valve 300.

Two card slots 262 are symmetrically disposed on both sides of the cavity of the automatic exhaust valve mounting cavity 260, and a card member is disposed on the outer cavity wall of the automatic exhaust valve mounting cavity 260 between the two card slots 262. The returning member (not shown) is provided with a retreating boss that protrudes upward on the card retaining member. A sealing outer collar 316 is disposed outside the valve seat 310, so that when the automatic exhaust valve 300 is installed in the automatic exhaust valve mounting cavity 260, a U-shaped card member 320 is inserted into the two card slots 262 and sealed. The upper exhaust ring 316 is pressed over, and the automatic exhaust valve 300 can be securely mounted in the automatic exhaust valve mounting chamber 260. When the U-shaped card member 320 is inserted into place, the U-shaped card member 320 will press down the card retaining member and over the retaining boss, and the retaining boss can hold the U-shaped catch member 320 against it.

A sealed inner ring 264 and a step 265 are disposed within the automatic vent valve mounting cavity 260.

Referring to FIG. 4, the automatic vent valve 300 includes a valve seat 310, a spool assembly 330, a float 340 and a cap 350. A cavity 312 is received in the valve seat 310 for receiving the spool assembly 330, on the side of the valve seat 310. The wall has a threaded hole 313 for mounting the valve core assembly 330; a top of the valve seat 310 is provided with a cap mounting post 314 protruding from the top of the valve seat 310, and a first exhaust hole 315 is disposed in the cap mounting post 314; The first exhaust hole 315 is a tapered hole that is large and small.

The spool assembly 330 includes a spool 331, a valve plug 332, a valve stem 333, and a spring 334. The first end of the spool 331 is provided with an external thread 331a connected to the threaded hole 313 of the valve seat 310. The external thread 331a of the core 331 is threaded into the threaded bore 313 in the valve seat 310 to allow the spool assembly 330 to be laterally mounted within the cavity 312 of the valve seat 310.

The second end of the spool 331 is internally provided with a second exhaust hole 331b and a third exhaust hole 331c which intersect at a cross. After the spool assembly 330 is installed in position, the third exhaust hole 331c and the first exhaust hole 315 are provided. Connected. A valve plug 332 is mounted in the first end of the valve stem 333 for sealing the intake port of the second venting opening 331b; and a second end of the valve stem 333 is coupled to the second end of the spool 331 via a spring 334.

The float 340 is floatingly mounted on the valve seat 310 by a U-shaped rail frame 341 attached to the valve seat 310. In the lower part, the float 340 is floatingly located in the U-shaped rail frame 341, and a rail groove 342 for accommodating the U-shaped rail frame 341 is symmetrically disposed on the side of the float 340, and a part of the two rails of the U-shaped rail frame 341 fall into the rail slot. In 342 (in conjunction with Fig. 5), the float 340 can move up and down smoothly. The float 340 is connected to the second end of the valve stem 333 through a wire 343; the cavity 312 in the upper portion of the float 340 is a gas accumulating cavity, and the gas accumulating cavity is located above the entire wide casing 210, thus entering the automatic exhaust valve mounting cavity. The gas and medium of 260, only gas will enter the gas accumulation chamber through the gap between the float 340 and the inner wall of the valve seat 310.

The cap 350 is screwed onto the cap mounting post 314. On the inner top surface of the cap 350, an air outlet sealing ring 351 protruding downward to seal the first exhaust hole 315 is provided, and the outer ring surface of the air outlet sealing ring 351 is provided. The 351a is a tapered surface, so that when the cap 350 is rotated, the gap between the outer ring surface 351a of the air outlet seal ring 351 and the first exhaust hole 315 can be adjusted to adjust the amount of exhaust gas. A fourth exhaust hole 352 is defined in a side of the cap 350.

Referring to FIG. 3, a sealing outer collar 316 and a sealing outer annular surface 317 disposed under the sealing collar 316 are disposed outside the valve seat 310, and the sealing outer annular surface 317 and the inner portion of the automatic exhaust valve mounting cavity 260 are sealed. The rings 264 cooperate to form a first seal. A seal ring 318 is disposed between the seal outer collar 316 and the step 265 to form a second seal. The gas and the medium entering the automatic exhaust valve installation chamber 260 are not passed by the automatic exhaust valve 300 through the two seals. The gap between the automatic exhaust valve mounting chamber 260 overflows and the gas function is discharged through the automatic exhaust valve.

The specific implementation of the present invention obtained according to the above technical solution is as follows:

When the entire shielded electric pump is in operation, the gas and medium entering the inlet chamber 211 will enter the automatic exhaust valve mounting chamber 260 from the air gap hole 261, and the gas continues to be separated by the gap between the float 340 and the inner wall of the valve seat 310. When entering the gas accumulating chamber, when the gas in the gas accumulating chamber accumulates a certain amount, the sum of the gas pressure in the gas accumulating chamber and the weight of the buoyancy 340 is greater than the buoyancy of the medium to the float 340, the gas presses the float 340 down, through the connection 343 pulls the second end of the valve stem 333, the second end of the valve stem 333 moves downward against the resistance of the spring 334, so that the first end of the valve stem 333 will drive the valve plug 332 to open, and the second exhaust hole 33 The air inlet of the lb is opened, and the gas in the gas accumulation chamber enters the first exhaust hole 315 from the second exhaust hole 33 lb and the third exhaust hole 331c, and then the outer ring surface 351a and the first ring of the air outlet seal ring 351 A gap between the exhaust holes 315 is discharged through the fourth exhaust hole 352 on the cap 350. When the gas is discharged by a certain amount, the sum of the gas pressure in the gas accumulating chamber and the weight of the buoyancy 340 is greater than the medium to the float. The buoyancy of 340, the float 340 rises, and the wire 343 loses the pulling force. Under the action of the spring 334, the first end of the valve stem 333 will drive the valve plug 332 upside down, and the air inlet of the second exhaust hole 331b will be closed.

The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the foregoing embodiments, and that the present invention is only described in the foregoing embodiments and the description of the present invention, without departing from the spirit and scope of the invention. Various changes and modifications are intended to fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and their equivalents.

Claims

Rights request

A shielded electric pump applied to a closed circulation system, comprising a shield motor and a pump driven by a shield motor, the pump comprising a pump casing and an impeller, wherein the pump casing is connected to a motor casing of the shield motor, The impeller is coupled to a rotor shaft of the shielded motor, and a partition disposed in the pump casing is partitioned into a water inlet chamber and an impeller mounting chamber, and a stationary port is disposed in a center of the partition The sleeve is characterized in that an automatic exhaust valve mounting cavity is disposed on the pump body, and an air gap hole communicating with the water inlet cavity of the pump body is defined in the cavity wall of the automatic exhaust valve mounting cavity; The cavity of the automatic exhaust valve mounting cavity is provided with a card slot, and an automatic exhaust valve is installed in the automatic exhaust valve mounting cavity by a card inserted into the card slot.

2. The shielded electric pump for use in a closed circulation system according to claim 1, wherein the automatic exhaust valve comprises:

a spool assembly, the wide core assembly includes a spool, a valve plug, a valve stem, a spring, and the first end of the spool is provided with an external thread connected to a threaded hole in the valve seat, The external thread of the valve core is screwed into the threaded hole in the valve seat, so that the valve core assembly is laterally installed in the cavity of the valve seat; the second end of the valve core is internally provided with a cross intersection a second exhaust hole and a third exhaust hole, the third exhaust hole being in communication with the first exhaust hole; the valve plug being mounted in the first end of the valve stem for sealing the second row An air inlet of the air hole; the second end of the valve stem is connected to the second end of the valve body by a spring;

a float, the float is floatingly mounted under the valve seat by a U-shaped rail frame connected to the valve seat, the float is floatingly located in the U-shaped rail frame, and the float is connected through a line The second end of the valve stem is connected; the cavity of the upper part of the float is a gas accumulation cavity;

3. The shielded electric pump for use in a closed circulation system according to claim 2, wherein a sealing outer convex ring and a sealing outer annular surface disposed under the sealing convex ring are disposed outside the valve seat, Providing a seal sealing function with the sealing outer ring surface in the automatic exhaust valve mounting cavity The inner ring and a step that cooperates with the sealing outer ring to seal, and a sealing ring is disposed between the sealing outer ring and the step.

4. The shielded electric pump for use in a closed circulation system according to claim 2, wherein a guide groove for accommodating the U-shaped rail frame is symmetrically disposed on a side of the float.

The shielded electric pump applied to the closed circulation system according to claim 2, wherein the first exhaust hole is a tapered hole having a large upper and lower diameter, and an air outlet opening on the rotary cap is sealed. The outer annular surface of the ring that acts as a seal is a tapered surface.

6. The shielded electric pump for use in a closed circulation system according to claim 1, wherein said impeller includes an impeller front cover and an impeller rear cover that are connected to each other, and said impeller front cover and impeller An impeller chamber is disposed between the rear cover plates, and a suction port communicating the impeller chamber and the water inlet chamber is disposed at a center of the front plate of the impeller, and a ring groove is provided at a lip of the suction port, and the static mouth sleeve is disposed Inserted into the annular groove, a double-port annular seal is formed between the static mouthpiece and the mouth of the suction port; and a connecting sleeve connected to the rotor shaft is disposed at the center of the rear cover of the impeller.